<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>03-21</title>
  <script src="../../javascript/jquery-1.9.1.min.js" type="text/javascript"></script>
  <script src="../../js/js/03-21.js" type="text/javascript"></script>
</head>
<body>
<form>
  用户名:<input type="text" id="name"  style="display: none" onkeyup="userInput()">
  密码:<input type="password" id="pwd" onkeyup="userInput()">
  确认密码:<input type="password" id="pw" onkeyup="userInput()">
  <p style="position:relative;" id="dd"><span style="background:#98bf21;height:100px;width:200px;position:absolute;top:200px;left:200px;">csd</span></p>

  <div style="background:#98bf21;height:100px;width:200px;position:absolute;">HTML</div>
  <!--<p style="position:relative;" >我会动</p>-->
  <!--所有 HTML 元素都有一个静态位置，且无法移动.
  必须把元素的css position的属性设置为relative/fixed 或 absolute！-->
</form>
<!--<button id="btn" disabled="true">提交</button>-->
<button id="btn" >提交</button>
<button id="tz" style="margin-top: 200px">点我停止</button>
</body>
</html>
